US7468091B2 - Method for dehumidifying air and air dehumidifier for oil-insulated transformers, reactance coils and step switches - Google Patents

Method for dehumidifying air and air dehumidifier for oil-insulated transformers, reactance coils and step switches Download PDF

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Publication number
US7468091B2
US7468091B2 US10/576,157 US57615704A US7468091B2 US 7468091 B2 US7468091 B2 US 7468091B2 US 57615704 A US57615704 A US 57615704A US 7468091 B2 US7468091 B2 US 7468091B2
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United States
Prior art keywords
air
housing
granulate
expansion vessel
oil
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Expired - Fee Related, expires
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US10/576,157
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English (en)
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US20070199443A1 (en
Inventor
Karsten Viereck
Dieter Dohnal
Ansgar Hinz
Reiner Brill
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Maschinenfabrik Reinhausen GmbH
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Maschinenfabrik Reinhausen GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only

Definitions

  • the invention relates to a method for air dehumidification for oil-insulated transformers, reactance coils and step switches, for dehumidification of the air inducted into oil expansion vessels.
  • the invention additionally relates to an air dehumidifier suitable therefor.
  • An oil expansion vessel is usually provided for oil-filled transformers, reactance coils or step switches in order to compensate for the changes in volume of the insulating oil caused by temperature changes.
  • an air dehumidifier is known from EP 1 313 112 A1.
  • This known air dehumidifier comprises a housing in which a moisture-absorbing absorption medium or granulate, which is flowed through by the inducted air, is arranged.
  • the granulate is regeneratable, i.e. by heating in the saturated state it is repeatably restorable to the moisture-accepting state.
  • a heating device in the housing serves for baking the granulate, the heating device being controlled in drive by a moisture sensor which is arranged above the housing so that the air already led through the granulate flows around it. If the moisture sensor signals an impermissible moisture content of the inducted air and thus saturation of the granulate the heating device is actuated, the granulate baked and the granulate is thus restored again to the moisture-accepting state.
  • a magnetic valve is located between the housing with the moisture-absorbing granulate and an oil reserve arranged thereabove. This magnetic valve is closed during the described baking; after the heating device has been switched off, the valve is opened again.
  • the general inventive concept basic to both the method for air dehumidification and the air dehumidifier is to omit the magnetic valve according to state of the art and instead thereof to detect the presence of an air flow in the air dehumidifier and optionally the flow direction thereof and in the case of a signal, which is delivered by a humidity sensor according to the state of the art, for baking to actually allow actuation of the heating device only if either no air flow is present or if the air is escaping from the oil expansion vessel, but in no case during induction of air into the oil expansion vessel.
  • Commercially available air flow sensors are usable for detection of a flow and, in a given case, the flow direction.
  • FIG. 1 shows the schematic flow chart of a first method according to the invention
  • FIG. 2 shows the schematic flow chart of a second method according to the invention
  • FIG. 3 shows a schematic view of an air dehumidifier according to the invention
  • FIG. 4 shows a further schematic view, which is turned horizontally through 90 degrees, of this air dehumidifier.
  • the air humidity F r is measured by a moisture sensor, which is known from the state of the art and disposed physically between the granulate-filled housing of the air dehumidifier and the oil expansion vessel, and is subsequently compared with a predetermined limit value F max . If this limit value is attained or exceeded, according to the state of the art the magnetic valve was closed, the heating device controlled in drive and the granulate baked. In the case of the method according to the invention, thereagainst, it is additionally checked in such a case whether an air flow is present in the air dehumidifier and, if so, in which direction this runs. Only if an air flow is not present or if an air flow which is present is directed outwardly, i.e. into the free atmosphere, is the heating device actuated. The information of the (known) humidity sensor for actuation of the heating device is thus linked with further information about the air flow.
  • FIG. 2 A further method according to the invention is schematically illustrated in FIG. 2 , in which, if it is established as a result of a comparison of the measured air humidity F r with the limit value F max this limit value is reached or exceeded, a comparison of the pressure P u in the pipe duct in front of the air dehumidifier with the external pressure P a is additionally undertaken. Only if, in addition to the excessive air humidity, the pressure P u is greater than or equal to the external pressure P a does actuation of the heating device take place and the granulate is baked and restored again to the moisture-accepting state.
  • FIGS. 3 and 4 An air dehumidifier according to the invention is illustrated in FIGS. 3 and 4 and described in more detail in the following.
  • the air dehumidifier according to the invention has an upper flange 1 and a lower closure cap 2 ; a housing 5 is disposed therebetween, a cylinder of Duran glass being particularly suitable for that purpose.
  • the lower closure cap 2 is made, with particular advantage, from metal or another material with good specific thermal conductivity and has an internal contour of funnel-shaped form. A defined, locally limited condensation of the baked liquid is achieved by this construction of the lower closure cap 2 with good specific thermal conductivity. This is particularly so because the cylinder 5 of Duran glass has a significantly poorer thermal conductivity.
  • a filter 3 of sintered bronze with a brass foot, through which the condensed liquid can issue downwardly, is provided in the middle at the deepest point of the lower closure cap 2 .
  • a switch housing 4 is arranged laterally.
  • This switch housing 4 is fixed by means of spring ring 7 and cylinder screw 15 .
  • the housing 5 is sealed by lower and upper sealing rings 8 relative to the flange 1 as well as the lower housing cap 2 .
  • a granulate housing 20 which is filled with granulate 23 and has a heater 10 in the interior, is disposed within the housing 5 .
  • Cable screw connections 11 are located at the underside of the switch housing 4 .
  • a screw connection by means of cylinder screw 12 with a spacer washer 21 is provided at the top in the flange 1 ; from below, the granulate housing 20 with the heater 10 is held by spindles 14 led perpendicularly through the lower closure cap 2 .
  • Fixing in the horizontal position is effected by means of nuts 16 ; respective lock washers 24 are, in addition, inserted.
  • the lower fastening of the closure cap 2 is effected by knurled nuts 18 tightened on the spindles 14 .
  • an insulating ring 19 is provided in the upper region, below the flange 1 .
  • the reference numeral 22 denotes a sleeve plug, shown only schematically.
  • a double screw connection 25 which co-operates with a screw connection of the flange 1 , wherein in turn a screwed-in screw connection 26 , together with a connecting flange 27 fastened by that, is provided therein, the flange in turn producing the connection—not illustrated here—with the oil expansion vessel.
  • a humidity sensor 28 known from the state of the art and additionally a relative pressure sensor 29 according to the invention are screw-fitted in the upper region of the flange 1 to respectively extend into the hollow interior.
  • the electrical connecting lines are indicated only schematically.
  • the humidity sensor 28 detects, as known from the state of the art, the moisture state of the air flowing around it.
  • the relative pressure sensor 29 additionally arranged in accordance with the invention supplies additional information about whether or not the pressure P u in the interior of the air dehumidifier is greater than or equal to the external pressure P a . If this is the case, then the additionally necessary condition for switching-on the heater 10 is fulfilled and the granulate 23 is baked.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Drying Of Solid Materials (AREA)
  • Transformer Cooling (AREA)
  • Air Humidification (AREA)
US10/576,157 2003-12-06 2004-12-03 Method for dehumidifying air and air dehumidifier for oil-insulated transformers, reactance coils and step switches Expired - Fee Related US7468091B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10357085A DE10357085B3 (de) 2003-12-06 2003-12-06 Verfahren zur Luftentfeuchtung und Luftentfeuchter für ölisolierte Transformatoren, Drosselspulen sowie Stufenschalter
DE10357085.3 2003-12-06
PCT/EP2004/013774 WO2005055255A1 (de) 2003-12-06 2004-12-03 Verfahren zur luftentfeuchtung und luftentfeuchter für ölisolierte transformatoren, drosselspulen sowie stufenschalter

Publications (2)

Publication Number Publication Date
US20070199443A1 US20070199443A1 (en) 2007-08-30
US7468091B2 true US7468091B2 (en) 2008-12-23

Family

ID=34202456

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US10/576,157 Expired - Fee Related US7468091B2 (en) 2003-12-06 2004-12-03 Method for dehumidifying air and air dehumidifier for oil-insulated transformers, reactance coils and step switches

Country Status (11)

Country Link
US (1) US7468091B2 (de)
EP (1) EP1690267B1 (de)
JP (1) JP2007513508A (de)
KR (1) KR101056490B1 (de)
CN (1) CN1860563B (de)
AT (1) ATE397783T1 (de)
CA (1) CA2548618C (de)
DE (2) DE10357085B3 (de)
ES (1) ES2303961T3 (de)
PT (1) PT1690267E (de)
WO (1) WO2005055255A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220347622A1 (en) * 2019-09-04 2022-11-03 Comem S.P.A. Breather device for dehumidifying air to be supplied to an expansion vessel of a power electrical apparatus

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10315719B3 (de) * 2003-04-04 2004-12-23 Maschinenfabrik Reinhausen Gmbh Luftentfeuchter für ölisolierte Transformatoren, Drosselspulen sowie Stufenschalter
DE102006009668B3 (de) 2006-03-02 2007-04-12 Maschinenfabrik Reinhausen Gmbh Verfahren zur Trocknung eines Luftentfeuchters
ITVI20070222A1 (it) * 2007-08-07 2009-02-08 Comem Spa Essiccatore perfezionato per deumidificare l'aria destinata a vasi di espansione dell'olio impiegati in apparecchiature elettriche.
ATE492893T1 (de) * 2008-04-28 2011-01-15 Abb Technology Ltd Verfahren und vorrichtung zur bestimmung der relativen feuchtigkeit eines mit isolierender flüssigkeit gefüllten elektrischen gerätes
ITVI20100031A1 (it) * 2010-02-12 2011-08-13 Comem Spa Procedimento per il controllo di un essiccatore atto a deumidificare l'aria destinata a vasi di espansione dell'olio impiegati in apparecchiature elettriche
JP5377527B2 (ja) * 2011-01-14 2013-12-25 中国電力株式会社 吸湿呼吸器
EP2514511B1 (de) 2011-04-20 2019-07-31 ABB Schweiz AG Luftdehydrierende Entlüftungseinrichtung zur Bereitstellung von entfeuchteter Luft für Elektrogeräte und zugehöriges Verfahren
CN102290199B (zh) * 2011-05-09 2013-01-16 华东理工大学 多通道可切换电加热干燥器
CN102886191B (zh) * 2011-07-22 2014-10-01 上海智瑞达电气科技有限公司 一种用于对进入电气设备油膨胀箱空气进行干燥的空气干燥装置
US8871005B2 (en) * 2012-12-31 2014-10-28 Qualitrol Company, Llc Methods of regenerating desiccant in a breathing apparatus
CN105582789A (zh) * 2014-11-15 2016-05-18 湖北汽车工业学院 一种带湿度调节装置的车用空气干燥器
CN106228766B (zh) * 2016-09-13 2018-05-22 国网山东省电力公司德州供电公司 变压器呼吸器显示预警系统
DE102018213341A1 (de) * 2018-08-08 2020-02-13 Siemens Aktiengesellschaft Ermittlung des Feuchteintrags in ein Trocknungsmittel bei Transformatoren
CN113695311A (zh) * 2020-11-10 2021-11-26 景能科技有限公司 一种电气滑环清洗装置及方法
DE102022113565B3 (de) * 2022-05-30 2023-11-09 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Antriebseinheit

Citations (8)

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Publication number Priority date Publication date Assignee Title
US1476138A (en) * 1923-12-04 Transformer
US1601308A (en) * 1924-10-14 1926-09-28 Westinghouse Electric & Mfg Co Indicating dehydrator
US1759971A (en) * 1924-09-22 1930-05-27 Ohio Brass Co Apparatus for controlling breathing of oil-containing housings
JPS60198710A (ja) 1984-03-23 1985-10-08 Toshiba Corp 油入電器の吸湿呼吸装置
US5902381A (en) 1997-05-30 1999-05-11 General Signal Corporation Dehydrating breather apparatus
US20030089238A1 (en) 2001-11-13 2003-05-15 Messko Albert Hauser Gmbh & Co. Kg Air demoisturizer for oil-insulated transformers, chokes and tap changers
US6800114B2 (en) * 2002-08-07 2004-10-05 Andrew Corporation Pressure equalization apparatus and methods
US7332015B2 (en) * 2002-09-06 2008-02-19 Waukesha Electric Systems, Inc Automatic dehydrating breather apparatus and method

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JPS6076013U (ja) * 1983-10-31 1985-05-28 株式会社東芝 油入電器の吸湿呼吸装置
JPS6375009U (de) * 1986-11-06 1988-05-19
CN87208681U (zh) * 1987-05-26 1988-08-10 云南省电子工业局试验研究所 高压充油设备防潮装置
JPH10135043A (ja) * 1996-10-30 1998-05-22 Nippon Koei Co Ltd 吸湿呼吸器における吸湿剤の取出装置およびその取出装置を有する吸湿呼吸器

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1476138A (en) * 1923-12-04 Transformer
US1759971A (en) * 1924-09-22 1930-05-27 Ohio Brass Co Apparatus for controlling breathing of oil-containing housings
US1601308A (en) * 1924-10-14 1926-09-28 Westinghouse Electric & Mfg Co Indicating dehydrator
JPS60198710A (ja) 1984-03-23 1985-10-08 Toshiba Corp 油入電器の吸湿呼吸装置
US5902381A (en) 1997-05-30 1999-05-11 General Signal Corporation Dehydrating breather apparatus
US20030089238A1 (en) 2001-11-13 2003-05-15 Messko Albert Hauser Gmbh & Co. Kg Air demoisturizer for oil-insulated transformers, chokes and tap changers
US6800114B2 (en) * 2002-08-07 2004-10-05 Andrew Corporation Pressure equalization apparatus and methods
US7332015B2 (en) * 2002-09-06 2008-02-19 Waukesha Electric Systems, Inc Automatic dehydrating breather apparatus and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220347622A1 (en) * 2019-09-04 2022-11-03 Comem S.P.A. Breather device for dehumidifying air to be supplied to an expansion vessel of a power electrical apparatus

Also Published As

Publication number Publication date
ATE397783T1 (de) 2008-06-15
ES2303961T3 (es) 2008-09-01
KR101056490B1 (ko) 2011-08-11
DE502004007335D1 (de) 2008-07-17
HK1093816A1 (en) 2007-03-09
CN1860563B (zh) 2011-04-13
US20070199443A1 (en) 2007-08-30
CN1860563A (zh) 2006-11-08
EP1690267A1 (de) 2006-08-16
JP2007513508A (ja) 2007-05-24
KR20060126634A (ko) 2006-12-08
EP1690267B1 (de) 2008-06-04
PT1690267E (pt) 2008-06-23
WO2005055255A1 (de) 2005-06-16
DE10357085B3 (de) 2005-03-17
CA2548618A1 (en) 2005-06-16
CA2548618C (en) 2013-01-15

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